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SRX550 HM Power System

SRX550 High Memory Services Gateway Power Supply

The SRX550 High Memory Services Gateway uses either one AC or one DC power supply unit (PSU). The services gateway is equipped with one AC power supply (see Figure 1) for non-power redundancy. A second PSU is optional (sold separately) for power redundancy.

A second PSU can be used to meet power requirements exceeding the wattage provided by a single PSU (a nonredundant configuration). The two power supplies, either both AC or both DC, will load-share and provide power redundancy to the services gateway, increasing its availability and reliability. If one power supply fails or is removed, the other power supply redistributes the electrical load without interruption. The services gateway reassesses the power required to support its configuration and issues errors if the available power is insufficient. Figure 2 shows the DC power supply.

CAUTION:

Do not mix AC and DC power supplies within the same services gateway because this can damage the device.

All power supplies are hot-swappable and support single or dual redundant power supply versions. Each power supply is cooled by the system’s fans.

Figure 1: AC Power Supply AC Power Supply

Figure 2: DC Power Supply DC Power Supply

The power supplies provide different output wattage to the services gateway components according to the voltage requirements of the components.

The power supply components are listed in Table 1.

Table 1: Component Power Output/Consumption

Power Supply

Output/Consumption

645 W AC power supply

This power supply can provide:

  • 390 W at 12 V

  • 255 W PoE on a single power supply, or with redundancy using the two power supplies

  • 510 W PoE using the two power supply option operating as nonredundant

Note:

Using the two power supply option operating as nonredundant for up to 510 W PoE power, the administrator has the ability to prioritize the PoE ports that will receive power if an outage should occur to either the power source or to one of the power supplies.

645 W DC power supply

This power supply can provide:

  • 390 W at 12 V

  • 255 W PoE on a single power supply, or with redundancy using the two power supply option

  • 510 W PoE using the two power supply option operating as nonredundant

Note:

Using the two power supply options operating as nonredundant for up to 510 W PoE, the administrator has the ability to prioritize the PoE ports that will receive power if an outage should occur to either the power source or to one of the power supplies.

The DC power supply has connections for two DC power feeds labeled A and B, each with a positive (+) and a negative (-) terminal. You can connect the DC power supply to both the feeds. If either feed fails, the power supply draws all its power from the other feed. This configuration provides the commonly deployed A/B feed redundancy for the system. Table 2 describes the connection terminals on the DC power supply.

Table 2: DC Power Supply Terminals

Feed

Label

Description

Feed A

A+

RTN connection for Feed A

A-

-48VDC connection for Feed A

Feed B

B+

RTN connection for Feed B

B-

-48VDC connection for Feed B

SRX550 High Memory Services Gateway Supported AC Power Cords

Warning:

The AC power cord for the services gateway is intended for use with the services gateway only and not for any other use.

Note:

In North America, AC power cords must not exceed 4.5 m (approximately 14.75 ft) in length, to comply with National Electrical code (NEC) Section 400-8 (NFPA 75, 5-2.2) and 210-52, and Canadian Electrical Code (CEC) Section 4-010(3).

Table 3 provides power cord specifications, and Figure 3 depicts the plug on the AC power cord provided for each country or region.

Table 3: AC Power Cord Specifications

Country

Electrical Specification

Plug Standards

Australia

250 VAC, 10 A, 50 Hz

AS/NZ 3112-1993

China

250 VAC, 10 A, 50 Hz

GB2099.1 1996 and GB 1002 1996 (CH1-10P)

Europe (except Italy and United Kingdom)

250 VAC, 10 A, 50 Hz

CEE (7) VII

Italy

250 VAC, 10 A, 50 Hz

CEI 23-16/VII

Japan

125 VAC, 12 A, 50 or 60 Hz

JIS 8303

North America

125 VAC, 10 A, 60 Hz

NEMA 5-15

United Kingdom

250 VAC, 10 A, 50 Hz

BS 1363A

Figure 3: AC Plug TypesAC Plug Types
Note:

Power cords and cables must not block access to services gateway components or drape where people might trip on them.

SRX550 High Memory Services Gateway AC Power Supply Electrical Specifications

The AC power supply electrical specifications for the SRX550 High Memory Services Gateway are listed in Table 4.

Table 4: AC Power Supply Electrical Specifications for the SRX550 High Memory Services Gateway

Power Requirement

Specification

AC input voltage

100 to 240 VAC

AC input line frequency

50 to 60 Hz

AC system current rating

7.6 to 3.8 A

SRX550 High Memory Services Gateway DC Power Cable Specifications

The DC power supply in slot 0 must be powered by dedicated power feeds derived from feed A, and the DC power supply in slot 1 must be powered by dedicated power feeds derived from feed B. This configuration provides the commonly deployed A/B feed redundancy for the system.

CAUTION:

You must ensure that power connections maintain the proper polarity. The power source cables might be labeled (+) and (–) to indicate their polarity. There is no standard color coding for DC power cables. The color coding used by the external DC power source at your site determines the color coding for the leads on the power cables that attach to the terminal studs on each power supply.

Warning:

For field-wiring connections, use copper conductors only.

For other electrical safety information, see SRX550 High Memory Services Gateway Electrical Wiring Guidelines.

CAUTION:

Power cords and cables must not block access to services gateway components or drape where people could trip on them.

Table 5 summarizes the specifications for the power cable(s), which you must supply.

Table 5: DC Power Cable Specifications

Cable Type

Quantity and Specification

Power

8 AWG, minimum 60°C wire, or as permitted by the local code

SRX550 High Memory Services Gateway DC Power Supply Electrical Specifications

Table 6 lists the DC power supply electrical specifications for the SRX550 High Memory Services Gateway.

Table 6: DC Power Supply Electrical Specifications for the SRX550 High Memory Services Gateway

Power Requirement

Specification

DC input voltage

Operating range: –40 to –72 VDC

DC system current rating

16 A at –48 VDC